Abstract：Objective：Literature study on irritable bowel syndrome(IBS) was carried out to explore the characteristics of constitution distribution of patients with IBS. Methods： The literatures of constitution identification and epidemiological research were searched and filtrated online from CNKI， Wanfang， VIP and CBM， and the information database of constitution distribution of IBS was established. Analyzed the constitution distribution of IBS and its different subtypes，and compared the constitution distribution data with the normal population in China to analyze the constitution distribution characteristics of the former. Results：12 references were included，with a total of 2 043 patients including 962 males and 1 081 females. The most common constitutions of IBS were yang-deficiency(22.2%)，qi-stagnation(21.5%)，qi-deficiency (13.4%) and damp-heat(12.2%)，among which the proportion of yang-deficiency(25.5%) was more obvious in patients with IBS-D，while the proportion of qi-stagnation(30.9%) and damp-heat(18.1%) in patients with IBS-C was more significant. The proportion of yin deficiency(11.4%) was much in IBS- C than IBS- D. The proportion of qi- stagnation(21.1%) in female patients with IBS-D was higher than that in male patients(16.1%)，while the proportion of phlegm-dampness(13.0%) in male patients was higher than that in female patients(7.4%). Compared with the normal population，the proportion of yin-deficiency and qi- stagnation in IBS patients increased significantly，while the proportion of peaceful and blood- stasis in IBS patients decreased significantly. Conclusion：The physical distribution of IBS patients is different from that of the normal population. Yang deficiency，qi stagnation，qi deficiency and dampness and heat are the main types of IBS，and different subtypes and gender have a certain impact on the physical distribution.